Update TRANSPOSE_CONV_2D docs

* Add info about per-channel quantization
* Update current.txt

Test: mma
Change-Id: I197d984c8b65b4c46bf526eb137f212ad8844926
Merged-In: I197d984c8b65b4c46bf526eb137f212ad8844926
(cherry picked from commit 44015c090ae4d7df4b723b1928c2a446d49be6bf)
2 files changed